.coluum-menu ul {
    column-count: 2;
}

/* #searchResults {
    position: absolute;
    width: 100%;
    background: #fff;
    border-radius: 8px;
    margin-top: 5px;
    max-height: 250px;
    overflow-y: auto;
    z-index: 999;
}

.controls select {
    border-radius: 25px;
    border: 1px solid #d5d5d5;
    padding: 0 10px;
}

.search-item {
    padding: 10px;
    cursor: pointer;
    border-bottom: 1px solid #eee;
}

.search-item:hover {
    background: #f5f5f5;
} */


/* :root {
    --primary: #2563eb;
    --primary-soft: #eff6ff;
    --primary-hover: #1d4ed8;
    --accent-yellow: #facc15;
    --text-main: #0f172a;
    --text-muted: #1a1b1d;
    --bg-page: #f9fafb;
    --bg-hero: #f8f5ef;
    --border: #e5e7eb;
    --sidebar-width: 280px;
    --radius-lg: 20px;
    --shadow-soft: 0 14px 30px rgba(15, 23, 42, 0.12);
    --fs-md: 1.1rem;
    --fs-base: 1.5rem;
    --fs-sm: 1.2rem;
    --fs-xs: 0.82rem;
    --fs-tiny: 0.75rem;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text-main);
    background: #ffffff;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.2s;
}

img {
    max-width: 100%;
    display: block;
}

h1,
h2,
h3,
h4 {
    margin: 0;
    font-weight: 700;
    line-height: 1.25;
}

p {
    margin: 0 31px 22px;
    font-size: var(--fs-sm);
    color: #374151;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98); */
    /* backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand-logo {
    font-size: 20px;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-logo span {
    color: var(--text-main);
}

.nav-menu {
    display: flex;
    gap: 22px;
    font-size: 14px;
}

.nav-menu a {
    color: var(--text-muted);
    font-weight: 500;
    position: relative;
}

.nav-menu a:hover {
    color: var(--primary);
}

.nav-menu a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.18s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

.header-cta {
    background: var(--text-main);
    color: #fff;
    padding: 7px 16px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    border: none;
    cursor: pointer;
}

.hero {
    background: var(--bg-hero);
    border-bottom: 1px solid #f3f4f6;
}

.hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px 46px;
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 40px;
    align-items: center;
}

.hero-left {
    max-width: 640px;
}

.hero-tags {
    display: flex;
    gap: 10px;
    margin-bottom: 18px;
}

.hero-pill {
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

.hero-pill.purple {
    background: #ede9ff;
    color: #6b21a8;
}

.hero-pill.yellow {
    background: #fef3c7;
    color: #92400e;
}

.hero-title {
    font-size: 46px;
    letter-spacing: -0.03em;
    margin-bottom: 18px;
}

.hero-meta-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 22px;
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.hero-meta-left {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hero-meta-bottom {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.meta-authors {
    display: flex;
    gap: 18px;
}

.author {
    display: flex;
    align-items: center;
    gap: 9px;
}

.author img {
    width: 40px;
    height: 40px;
    border-radius: 999px;
}

.author small {
    font-size: 11px;
    color: #9ca3af;
}

.author strong {
    font-size: 13px;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border-radius: 999px;
    border: 1px solid var(--border);
    padding: 7px 12px;
    background: #ffffff;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-muted);
}

.share-btn i {
    font-size: 14px;
}

.hero-right {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-art-wrapper {
    position: relative;
    width: 100%;
    max-width: 420px;
    overflow: visible;
}

.hero-art-bg {
    position: absolute;
    inset: -20px -10px -16px;
    background:
        radial-gradient(circle at 10% 20%, rgba(96, 165, 250, 0.3), transparent 55%),
        radial-gradient(circle at 90% 80%, rgba(244, 114, 182, 0.32), transparent 55%),
        #fef9c3;
    border-radius: 30px;
    opacity: 0.7;
}

.hero-art-card {
    position: relative;
    border-radius: 26px;
    padding: 18px;
    background: #fefefe;
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    z-index: 1;
}

.hero-art-card img {
    border-radius: 16px;
}

.hero-sticker-top {
    position: absolute;
    top: 10px;
    left: 16px;
    background: #fff;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.16);
    display: flex;
    align-items: center;
    gap: 6px;
}

.hero-sticker-bottom {
    position: absolute;
    bottom: 12px;
    right: 20px;
    background: #111827;
    color: #fff;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.4);
}

.float {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-8px);
    }

    100% {
        transform: translateY(0);
    }
}

.main-shell {
    max-width: 1200px;
    margin: 32px auto 72px;
    padding: 0 20px;
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    gap: 56px;
}


aside.sidebar::-webkit-scrollbar {
    width: 4px;
}

aside.sidebar::-webkit-scrollbar-thumb {
    background: #e5e7eb;
    border-radius: 999px;
}

.jump-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #9ca3af;
    font-weight: 700;
    margin-bottom: 12px;
    display: block;
}

.toc-list {
    border-left: 2px solid #f3f4f6;
    padding-left: 12px;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.toc-link {
    display: block;
    padding: 7px 0 7px 12px;
    margin-left: -12px;
    border-left: 2px solid transparent;
    font-size: 14px;
    color: var(--text-muted);
    transition: all 0.18s ease;
}

.toc-link:hover {
    color: var(--primary);
    transform: translateX(2px);
}

.toc-link.active {
    color: var(--primary);
    font-weight: 600;
    border-left-color: var(--primary);
    background: linear-gradient(90deg, #f0f9ff 0%, transparent 60%);
}

.sidebar-ad {
    margin-top: 34px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    border-radius: 18px;
    padding: 20px 18px 18px;
    color: #fff;
    box-shadow: 0 12px 30px rgba(37, 99, 235, 0.35);
    position: relative;
    overflow: hidden;
}

.sidebar-ad::before {
    content: "";
    position: absolute;
    width: 140px;
    height: 140px;
    background: radial-gradient(circle, rgba(239, 246, 255, 0.4), transparent 70%);
    top: -40px;
    right: -40px;
}

.sidebar-ad h3 {
    font-size: 17px;
    margin-bottom: 6px;
}

.sidebar-ad p {
    font-size: 13px;
    margin-bottom: 14px;
    color: #e5e7eb;
}

.ad-btn {
    border-radius: 999px;
    background: #111827;
    color: #fff;
    border: none;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(15, 23, 42, 0.45);
}

.sidebar-ad img {
    width: 85%;
    margin-top: 14px;
    border-radius: 14px;
    position: relative;
    z-index: 1;
}

.article-content {
    min-width: 0;
    font-size: 16px;
}

section {
    margin-bottom: 60px;
    scroll-margin-top: 130px;
}

.section-lead {
    font-size: var(--fs-base);
    font-weight: 500;
    margin-bottom: 14px;
    color: var(--text-main);
}

h2.section-title {
    font-size: 28px;
    color: #111827;
    margin-bottom: 12px;
}

h3 {
    font-size: 20px;
    margin: 20px 0 8px;
    color: #111827;
}

.key-takeaways {
    margin: 30px 0 10px;
    border-left: 4px solid var(--primary);
    padding-left: 20px;
}

.key-takeaways h4 {
    font-size: 16px;
    color: var(--primary);
    margin-bottom: 8px;
}

.info-box {
    margin: 22px 0;
    padding: 18px 18px 16px;
    border-radius: 12px;
    background: #eff6ff;
    border: 1px solid #dbeafe;
    display: flex;
    gap: 12px;
}

.info-box i {
    font-size: 18px;
    color: var(--primary);
    margin-top: 2px;
}

.info-box strong {
    display: block;
    font-size: 14px;
    margin-bottom: 4px;
}

.info-box p {
    margin-bottom: 0;
    font-size: 14px;
}

.info-box a {
    color: var(--primary);
    text-decoration: underline;
    font-weight: 500;
}

.arrow-list {
    list-style: none;
    padding: 0;
    margin: 0 0 12px;
}

.arrow-list li {
    position: relative;
    padding-left: 22px;
    margin-bottom: 10px;
    font-size: 16px;
}

.arrow-list li::before {
    content: "➜";
    position: absolute;
    left: 0;
    top: 1px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
}

.number-block {
    display: flex;
    gap: 16px;
    margin-bottom: 22px;
}

.num {
    font-size: 26px;
    font-weight: 800;
    color: #234fa6;
    min-width: 28px;
}

.num-content h3 {
    margin-top: 0;
}

figure {
    margin: 30px 0 6px;
}

figure img {
    width: 100%;
    border-radius: 16px;
    box-shadow: 0 10px 26px rgba(15, 23, 42, 0.12);
}

figcaption {
    text-align: left;
    font-size: 12px;
    color: #6b7280;
    margin-top: 8px;
}

.mobile-toc {
    display: none;
    margin-bottom: 22px;
}

.mobile-toc-toggle {
    width: 100%;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: #ffffff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 14px;
    font-size: 14px;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-muted);
}

.mobile-toc-panel {
    margin-top: 10px;
    border-radius: 16px;
    border: 1px solid #e5e7eb;
    background: #ffffff;
    box-shadow: 0 16px 30px rgba(15, 23, 42, 0.12);
    padding: 10px 0;
    display: none;
    overflow: hidden;
}

.mobile-toc-panel.open {
    display: block;
}

.mobile-toc-panel a {
    display: block;
    padding: 8px 16px;
    font-size: 14px;
    color: var(--text-muted);
}

.mobile-toc-panel a:hover {
    background: #f9fafb;
    color: var(--primary);
}

.related-section {
    margin-top: 10px;
}

.related-heading-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    gap: 12px;
}

.related-heading-row h2 {
    font-size: 22px;
}

.related-heading-row a {
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}



@media (max-width: 960px) {
    .nav-menu {
        display: none;
    }

    .hero-inner {
        grid-template-columns: 1fr;
        padding: 30px 18px 32px;
    }

    .hero-right {
        order: -1;
    }

    .hero-title {
        font-size: 34px;
    }

    .hero-meta-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-shell {
        grid-template-columns: 1fr;
        gap: 32px;
        margin-top: 26px;
    }

    aside.sidebar {
        display: none;
    }

    .mobile-toc {
        display: block;
    }

    .related-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (min-width: 961px) and (max-width: 1120px) {
    .hero-title {
        font-size: 40px;
    }

    .related-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
} */


/* contact page css */
.screen-reader-response {
    display: none;
}

fieldset.hidden-fields-container {
    display: none;
}

.contact-hero {
    padding: 3rem 0 1rem;
    text-align: center;
}

.contact-title {
    font-size: var(--fs-xxl);
    font-weight: var(--fw-bold);
    margin-bottom: 0.5rem;
}

.contact-sub {
    font-size: var(--fs-md);
    color: var(--muted);
}

.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.contact-card {
    background: #fff;
    border-radius: 20px;
    border: 1px solid rgba(148, 163, 184, 0.35);
    box-shadow: var(--shadow-sm);
    padding: 1.4rem;
    overflow: hidden;
}

.contact-form {
    display: grid;
    gap: 0.9rem;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem;
}

.form-group {
    display: grid;
    gap: 0.35rem;
}

.form-group label {
    font-size: var(--fs-xs);
    font-weight: 600;
    color: #475569;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    border: 1px solid rgba(148, 163, 184, 0.6);
    border-radius: 12px;
    padding: 0.7rem 0.9rem;
    font-size: var(--fs-base);
    outline: none;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06) inset;
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
}

.submit-row {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.contact-meta {
    display: grid;
    gap: 0.7rem;
}

.meta-item {
    display: flex;
    gap: 0.6rem;
    align-items: flex-start;
}

.meta-item i {
    color: var(--accent);
    font-size: 1.1rem;
}

.success {
    display: none;
    font-size: var(--fs-sm);
    color: var(--accent-dark);
}

@media (max-width: 960px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}